#include "client.h"
#include "snd_loc.h"
int cache_full_cycle;
byte *S_Alloc (int size);
void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
{
int outcount;
int srcsample;
float stepscale;
int i;
int sample, samplefrac, fracstep;
sfxcache_t *sc;
sc = sfx->cache;
if (!sc)
return;
stepscale = (float)inrate / dma.speed;
outcount = sc->length / stepscale;
sc->length = outcount;
if (sc->loopstart != -1)
sc->loopstart = sc->loopstart / stepscale;
sc->speed = dma.speed;
if (s_loadas8bit->value)
sc->width = 1;
else
sc->width = inwidth;
sc->stereo = 0;
if (stepscale == 1 && inwidth == 1 && sc->width == 1)
{
for (i=0 ; i<outcount ; i++)
((signed char *)sc->data)[i]
= (int)( (unsigned char)(data[i]) - 128);
}
else
{
samplefrac = 0;
fracstep = stepscale*256;
for (i=0 ; i<outcount ; i++)
{
srcsample = samplefrac >> 8;
samplefrac += fracstep;
if (inwidth == 2)
sample = LittleShort ( ((short *)data)[srcsample] );
else
sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8;
if (sc->width == 2)
((short *)sc->data)[i] = sample;
else
((signed char *)sc->data)[i] = sample >> 8;
}
}
}
sfxcache_t *S_LoadSound (sfx_t *s)
{
char namebuffer[MAX_QPATH];
byte *data;
wavinfo_t info;
int len;
float stepscale;
sfxcache_t *sc;
int size;
char *name;
if (s->name[0] == '*')
return NULL;
sc = s->cache;
if (sc)
return sc;
if (s->truename)
name = s->truename;
else
name = s->name;
if (name[0] == '#')
strcpy(namebuffer, &name[1]);
else
Com_sprintf (namebuffer, sizeof(namebuffer), "sound/%s", name);
size = FS_LoadFile (namebuffer, (void **)&data);
if (!data)
{
Com_DPrintf ("Couldn't load %s\n", namebuffer);
return NULL;
}
info = GetWavinfo (s->name, data, size);
if (info.channels != 1)
{
Com_Printf ("%s is a stereo sample\n",s->name);
FS_FreeFile (data);
return NULL;
}
stepscale = (float)info.rate / dma.speed;
len = info.samples / stepscale;
len = len * info.width * info.channels;
sc = s->cache = Z_Malloc (len + sizeof(sfxcache_t));
if (!sc)
{
FS_FreeFile (data);
return NULL;
}
sc->length = info.samples;
sc->loopstart = info.loopstart;
sc->speed = info.rate;
sc->width = info.width;
sc->stereo = info.channels;
ResampleSfx (s, sc->speed, sc->width, data + info.dataofs);
FS_FreeFile (data);
return sc;
}
byte *data_p;
byte *iff_end;
byte *last_chunk;
byte *iff_data;
int iff_chunk_len;
short GetLittleShort(void)
{
short val = 0;
val = *data_p;
val = val + (*(data_p+1)<<8);
data_p += 2;
return val;
}
int GetLittleLong(void)
{
int val = 0;
val = *data_p;
val = val + (*(data_p+1)<<8);
val = val + (*(data_p+2)<<16);
val = val + (*(data_p+3)<<24);
data_p += 4;
return val;
}
void FindNextChunk(char *name)
{
while (1)
{
data_p=last_chunk;
if (data_p >= iff_end)
{ data_p = NULL;
return;
}
data_p += 4;
iff_chunk_len = GetLittleLong();
if (iff_chunk_len < 0)
{
data_p = NULL;
return;
}
data_p -= 8;
last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
if (!memcmp(data_p, name, 4))
return;
}
}
void FindChunk(char *name)
{
last_chunk = iff_data;
FindNextChunk (name);
}
void DumpChunks(void)
{
char str[5];
str[4] = 0;
data_p=iff_data;
do
{
memcpy (str, data_p, 4);
data_p += 4;
iff_chunk_len = GetLittleLong();
Com_Printf ("0x%x : %s (%d)\n", (int)(uintptr_t)(data_p - 4), str, iff_chunk_len);
data_p += (iff_chunk_len + 1) & ~1;
} while (data_p < iff_end);
}
wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
{
wavinfo_t info;
int i;
int format;
int samples;
memset (&info, 0, sizeof(info));
if (!wav)
return info;
iff_data = wav;
iff_end = wav + wavlength;
FindChunk("RIFF");
if (!(data_p && !memcmp(data_p+8, "WAVE", 4)))
{
Com_Printf("Missing RIFF/WAVE chunks\n");
return info;
}
iff_data = data_p + 12;
FindChunk("fmt ");
if (!data_p)
{
Com_Printf("Missing fmt chunk\n");
return info;
}
data_p += 8;
format = GetLittleShort();
if (format != 1)
{
Com_Printf("Microsoft PCM format only\n");
return info;
}
info.channels = GetLittleShort();
info.rate = GetLittleLong();
data_p += 4+2;
info.width = GetLittleShort() / 8;
FindChunk("cue ");
if (data_p)
{
data_p += 32;
info.loopstart = GetLittleLong();
FindNextChunk ("LIST");
if (data_p)
{
if (!strncmp ((const char *)(data_p + 28), "mark", 4))
{ data_p += 24;
i = GetLittleLong (); info.samples = info.loopstart + i;
}
}
}
else
info.loopstart = -1;
FindChunk("data");
if (!data_p)
{
Com_Printf("Missing data chunk\n");
return info;
}
data_p += 4;
samples = GetLittleLong () / info.width;
if (info.samples)
{
if (samples < info.samples)
Com_Error (ERR_DROP, "Sound %s has a bad loop length", name);
}
else
info.samples = samples;
info.dataofs = data_p - wav;
return info;
}